Furnace for roasting ores, &amp;c.



PATENTED JAN. 17, 1905.

TOBEY.

v W. W. v P URNAGE POR ROASTING DRES, 65o.

APPLICATION FILED JAN. 13.1904.'

3 SHEETS-SHEET l.

PATENTED JAN. 17, 1905.

W. W. TBEY.

PURNACE FOR ROASTING GRES, &o.

APPLIGATION FILED JAN. 1s. 1904.

O O O O O O O O a sHBETsy- HB z.

OOOOOOO@ O 25 /VV N zzey A TTQHNE yy UNITED STATES Patented January 17, 19'05.

WILLIAM WALTER TOBEY, OF IOLA, KANSAS.

FURNACE FOR ROASTING CRES, 81.0'.

SPECIFICATION forming part of Letters Patent No. 780,387, dated January 17, 1905.

Application ned January 18,1904. serial No. 188,814.

To a/ZZ 071/0711, I? may concern,.-

Be it known that I, WILLIAM WALTER To-v scription.

My invention relates to kilns for roasting ores and the like, and relates to that type of kilns in which the furnace proper is divided into two parts. for the purpose of allowing rakes or agitators to pass longitudinally through lthe furnace.

My invention further relates to certain ima i cate corresponding parts in all the figures.

Figure 1 is a side elevation showing my kiln complete.k Fig. 2 is a fragmentary vertical section, somewhat enlarged, through one end of the same. Fig. 3 is a vertical cross-section upon the line m m of Fig. 1 looking in the direction of the arrow Fig. 4 is a vertical section through the feeding apparatus and means for adjusting the same. Fig. 5 is a vertical section upon the line 5 5 of Fig. 4 looking in the direction of the arrow. Fig. 6 is a vertical section through the rake-bar. Fig. 7 is a perspective view of one of the backstays used for supporting certain stationary parts of the mechanism, and Fig. 8 is a fragmentary view of a sectional bar for closing the aperture between the two main stationary members of the furnace proper.

Upon the pedestals 9 10 are vrespectively mounted the frames 11 12,provided with bearings 13, and upon these frames are rockershaped guards 14 15, held upon the frames by means of fastenings 16. Revolubly mounted within the'bearings 13 are shafts 17 19, the shaft 17 being provided with sprocket-wheels 18, rigidly connected thereto. Sprocketwheels 2() and a gear-wheel 21 are rigidly mounted upon the shaft 19. Another gearwheel, 21, meshes with the gear-wheel 21 for the purpose of supplying power thereto. Two endless sprocket chains 22 engage the sprocket-wheels 1S and l2O.

Mounted upon the respective pedestals 23 are a number of backstays 24, connected by bolts 2 4a and each provided with a concave portion 25, as shown more particularly in Figs. 3 and 7. Each backstay 24 is provided with separate lugs 26 26a, the lugs 26 engaging the pedestals 23 by means of bolts 27 and the lugs 26 being employed to support the main upper member.

The bed of the furnace is shown at 23a and is provided with I-beams 25, upon which rests the bottom plate 26D of the furnace proper.

Above this bottom plate 26D, between the two side walls 27, is a channel 28.

The upper member of the furnace proper is shown at 29 and is provided with aslot 30, through which the ore may be fed. A pair of metallic strips 31, each provided with a broad horizontal portion 31, are secured by means of bolts 32 upon the lugs 33, which are integral with the backstays 24. By this means the main upper member of thevfurnace proper is supported directly upon the backstays. Disposed near the bottom of thebackstays and partially encircled by the concave portions 25 thereof are rails 34, mounted upon lugs 34, as shown more particularly in Fig. 3. I

Secured upon the sprocket-chains 22 by meansof bolts 35 are cross-bars 36, which are free' to pass between the main upperand lower members of the furnace. Partially encircling the cross-bar 36 is a rectangular shield 37 of the shape indicated in cross-section in Fig. 6, this shield being inturn encircled by an endless member 38, of asbestos. rIhe asbestos is secured in position by means of longitudinal sections 39, of angle-iron, which may be secured in position by crimping their ends inward, so as to engage the inner surface of the shield 37, asindicated in Fig. 3.

The rake-blades are shown at 40, each being'mo'unted upon a stem 41, thesestems being engaged by revoluble nuts 42, 43, 44, and 45. By means of lthese nuts the rake-blades 40 may be adjusted independently of each other as to height compared with the bar 36 and may also be adjusted to any desired angle relatively to the general direction of this bar. Longitudinal beams 46 engage the backstays 24 and are partially supported thereby, these beams being provided with cross-beams 47, rigidly secured thereto and serving as braces therefor. Mounted upon the cross-beams 47 are rail-supporting beams 48, preferably of metal and each provided with revoluble rollers 49, mounted upon bolts 50, which rigidly engage the beams 48. The rails 52 are mounted upon the beams 48, and immediately below these rails are rollers 51, revolubly engaging the sprocket-chains 22.

The ventilator-holes 53 are of the usual type, and a smoke-stack 54 is provided for the purpose of allowing the escape of the gases of combustion and aeriform elements which will pass olf .from the substances being operated upon.

A hopper 55 surmounts a hollow cylindrical member 56, containing a revoluble cylinder 57, as shown more particularly in Fig. 2. The cylinder 57 is provided with disks 58 and with gages 59, each having the form of a board and being movable radially with reference to the cylinder 57. The disks 58 are provided with necks 60 61, integral therewith, as indicated more particularly in Fig. 4, the neck 61 being threaded so as to mate the threaded portion 62XL of the shaft 62. Toggle-links 63 are mounted upon toggle-heads 63h 63, as shown in Fig. 4, the outer ends of these toggle-links being pivoted to the gage-boards 59. The shaft 62 is provided with a hand-wheel 65.

Mounted upon the framework is a pin 66, provided with a retracting-spring 68, which engages a lever 67 and holds the same normally in a position approximately vertical, as indicated by dotted lines in the central portion of Fig. 5. A limiting-stop 67 prevents eX.- cessive movement of the lever 67 toward the left. A link 69 is connected with the lever 67 and with a radially-movable arm 70, this arm being provided with a pawl 7 0u, which engages a ratchet-wheel 71, this ratchet-wheel being rigidly secured upon the neck 61. By turning the liand\vlieel 65 in aloft-handed or contra-clockwise direction the shaft 62 is caused to move to the right as seen in Fig. 4, thereby drawing the gage-boards 59 radially inward and virtually increasing the capacity of the respective slots 59, as will be seen from Fig. 5. By turning the hand-wheel in a clockwise direction, however, the gage-boards 59 are driven radially outward, and the slots or pockets 59 are thus rendered shallower.

The truck-wheels 73 are connected together by links 74, these links serving to connect the cross-bars 36 upon the chains 22.

A sectional bar is shown at 75 and serves in a great measure to exclude the entrance of the air while the device is in operation. The sectional bar 75 is made of links, as shown in Fig. 8, each link being cutaway at 76, so as to form a journal, and provided with an annular boss 77 for the purpose of securing the several links together. Plates 78, of asbestos, are secured upon the respective links, each asbestos plate being provided with an undercut beveled edge 79. This undercut edge, together with the annular boss 77, serves as a fastening and holds the asbestos plates firmly in position.

Rigidly connected with the broad horizontal portion 31 of the metallic member 31 are a number of guard-plates 8() for the purpose of holding the sectional rod 75 in position. Any portion of the sectional rod 75 is free to move slightly upward; but the guard-plates 8O prevent any lateral movement thereof` When the rake-bar 36 passes between the main upper and lower members of the furnace, as indicated in Fig. 3, the sectional bar being` iiexible, as above described. yields slightly, as indicated in Fig. 2. The result is that as the bar 36 glides along the sectional bar closes the space immediately in front of it and immediately behind it, thereby practically excluding the air, as will be understood from Figs. 1 and 2. Each time one of the rake-bars 36 passes the lever 67 this lever is moved radially to the right from the view shown in Fig. 1, being immediately retracted by the torsional spring 68. This movement actuates the arm and moves the revoluble cylinde 57 a predetermined fraction of a revolution. This feed of the ore is of regular intermittence, subject Vonly to the qualification that the amount of feed is adjustable by means of the hanrtwhcel 65, as above described. A swinging door 81 opens and closes each time the rake-har 36 passes into the front end of the furnace.

1t will be noted that the wheels 73, connected with each end of the rake-bar 36, pass immediately adjacent to the several concave portions 25 of the backstays, the curvature of the concave portions 2,5 partially encircling the wheel, as indicated in Fig. 3. This construction enables the apparatus to be made much more compact and simple than would otherwise be the case and avoids the necessity of large cracks between the upper and lower members of the furnace proper'. The little air which canescape under the flexible sectional bar 7 5, as indicated in Fig. 2, is not sufficient to do any harm and may under certain conditions actually make the working of the kiln more satisfactory than would otherwise be the case, Power being applied by means of the shaft 19 and by means of the gear-wheel 21, the sp rocket-chains 22 are set into action,and these cause the revolution of the sprocket-wheels 18. Each revolution of the rake-bar 36 causes the lever 67 tobe tripped, as above described, thereby discharging a predetermined quanlOO l the portions of said rake-bars that enter the furnace whereby the said bars are protected from excessive heat. i

2. Ina kiln for roasting ores and the like, the combination of a furnace proper, traveling members disposed adjacent thereto, rakebars connected with said traveling members, shields secured to and encircling the portions of the rake-bars that enter the furnace, rakeblades connected with said rake bars and shields and adjustable vertically and angularly, and means for actuating said traveling members.

3. In a kiln for roasting ores and the like,

the combination of a two-part furnace proper,

traveling members disposed adjacent thereto, rake-bars. connected with said traveling members and free to pass between the main-members of said two-part furnace, a metallic shield partially vencircling said rake-bar, and a covering of heat-proof material connected with said shield.

4. In a kiln for roasting ores and the like, the combination Vof rake-bar, means for moving the same relatively to said furnace, a metallic member partially encircling said rakebar, .and a covering of heat-proof material mounted upon said metallic member for the purpose of protecting lthe same from excess of heat.

5. In a kiln for roasting ores and the like, the combination of a furnace, a' rake-bar connected therewith and mounted relatively thereto, a hollow metallic member secured to and encircling the portion of said rake-bar that enters the furnace, said member being free to fill with cold air when removed from said furnace, and means for causing said rake-bar and said metallic member to pass into and out of said furnace.

6. In a kiln for roasting ores and the like,

4the combination with a furnace having oppositely-arranged openings in its sides, and traveling rake-bars projecting out through said openings, of sectional bars arranged adjacent to the openings of the furnace, said bars each being formed of a plurality of links pivoted together, as and for the purpose set forth.

'7. In a kiln for roasting ores and the like, the combination with a furnace having oppositely-arranged openings in its sides, and traveling rake-bars projecting out through said openings, of sectional bars arranged adjacent lto the openings of the furnace, each bar being formed of a plurality of links pivoted together, and. plates of'asbestos secured upon the links. v

8. In a kiln for roasting ores and the like, a

Arake-bar, an open-ended shield encircling the rake-bar, and rake-blades having stems secured to the shield and rake-bar, as set forth'. 9. In a kiln for roasting ores and the like, a rake-bar, an open-ended shield encircling the rake-bar, rake-blades having stems extending through the shield and rake-bar, and nuts on the stems of the blades outside of the shield andbetween the shield and rake-bar, as set forth. In testimony -whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM WALTER TOBEY.

Witnesses:

.ADLAI M. EWING,

E. T. EWING. 

